John Marstall, designer for Black Pixel, details the steps that went into the design of NetNewsWire 4's new app icon, the beta of which I linked to on Tools & Toys the other day:

“With the release of NetNewsWire 4 Public Beta, we wanted to overhaul and modernize NetNewsWire’s app icon as much as the rest of the app. We didn’t throw out everything — the color scheme and satellite metaphor stayed — but the design is completely new.”

I love how much thought and care went into the design (and it certainly doesn't hurt that they're sticking with the astronomy theme).